Tuxera NTFS doesn't allow me to paste after the trial period. As soon as I plug my external hard disk, I get the message- "Your 15 day trial has expired. Please purchase a product key to continue using Tuxera NTFS for Mac, or uninstall the product "
hence, I'm using ntfs-mounter.

Interesting. I was using it for a few months with no such issues. I don't have Boot Camp installed at the moment… I wonder if they changed something with the latest versions.